Quantitative analysis of titanium ions in the equilibrium with metallic titanium in NaCl-KCl equimolar molten salt

Abstract

The equilibrium between titanium ions (Ti2+, Ti3+) and metallic titanium (Ti) in NaCl-KCl equimolar molten salt was investigated using TiCU and Ti. Equilibrium experiments were carried out in metal container of titanium or stainless-steel at 740°C The concentrations of titanium ions were determined by chemical methods consisting of continuous three steps. Ti2+ and Ti were quanti tated by H2 evolution method. Ti3+ was quantitated with titration by Fe3+. As the result, the concentration of Ti2+ was higher than that of Ti 3+. The concentration quotient, Kc = (x TI3+)2/(xT12+)3, depends on the concentration of Ti2+. The value of Kc at 740°C is recommended to be 5.9 at XT12+ -0.02 and 2.6 at xT12+ = 0.07 respectively. ©2010 The Japan Institute of Metals.